private void releaseLocks() {
if (lockElements != null) {
Collection<LockElement> releaseFailures = null;
Exception releaseException = null;
for (LockElement lockElement : lockElements) {
try {
lockElement.releaseIfAcquired();
} catch (Exception e) {
releaseException = e;
if (releaseFailures == null) {
releaseFailures = new ArrayList<>();
}
releaseFailures.add(lockElement);
}
}
if (releaseException != null) {
log.warn(
"Unable to release locks: "
+ releaseFailures
+ ". Example of exception:"
+ releaseException);
}
}
}
public <T extends PropertyContainer> T indexPutIfAbsent(
Index<T> index, T entity, String key, Object value) {
T existing = index.get(key, value).getSingle();
if (existing != null) {
return existing;
}
// Grab lock
IndexLock lock = new IndexLock(index.getName(), key);
TransactionState state = getTransactionState();
LockElement writeLock = state.acquireWriteLock(lock);
// Check again -- now holding the lock
existing = index.get(key, value).getSingle();
if (existing != null) {
// Someone else created this entry, release the lock as we won't be needing it
writeLock.release();
return existing;
}
// Add
index.add(entity, key, value);
return null;
}
